I am building a library on macOS v11 (Big Sur) using Java 8 from Adoptium (Eclipse Temurin).
To install Java, I am using the following commands:
brew tap homebrew/cask-versions
brew install --cask temurin8
Then, I export JAVA_HOME like this:
export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)
And it properly exports it. When I execute echo $JAVA_HOME, it returns:
/Library/Java/JavaVirtualMachines/temurin-8.jdk/Contents/Home
However, while building the library, it tries to find JNI, and it is returning the following lines:
CMake Error at /usr/local/Cellar/cmake/3.24.2/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:230 (message):
Could NOT find JNI (missing: JAVA_INCLUDED_PATH JAVA_INCLUDED_PATH2 AWT)
Is there anything else necessary to make this work on macOS?
Notes:
I installed CMake using Homebrew (brew install cmake).
I have already searched in Google and Stack Overflow, and none of the proposed solutions worked (I have also checked the recommended similar questions while creating this one).
I checked the variable values in the FindJNI.cmake file and everything seems correct (it should find it).
FindJNI.cmake, the value of JAVA_AWT_INCLUDE_DIRECTORIES is correct (/Library/Java/JavaVirtualMachines/temurin-8.jdk/Contents/Home/include), and jni.h is inside that directory. However, find_path(JAVA_INCLUDE_PATH 'jni.h' $(JAVA_AWT_INCLUDE_DIRECTORIES)) is not setting JAVA_INCLUDE_PATH properly.find_path(TEST 'jni.h' '/Library/Java/JavaVirtualMachines/temurin-8.jdk/Contents/Home/include'), looking for jni.h and it works. TEST contains the correct value.This is the call to find_package:
find_package(JNI 1.7 REQUIRED)
I was finally able to solve this by setting the requested variables as flags for CMake. I just appended the following to my CMake call:
cmake ... -DJAVA_HOME=$(/usr/libexec/java_home -v 1.8) -DJAVA_INCLUDE_PATH=$(/usr/libexec/java_home -v 1.8)/include -DJAVA_INCLUDE_PATH2=$(/usr/libexec/java_home -v 1.8)/include/darwin -DJAVA_AWT_INCLUDE_PATH=$(/usr/libexec/java_home -v 1.8)/include